v0.9.1

Critical Fix: Branch Preservation Before Session Abort

session.abort() triggers OpenCode's internal worktree cleanup, which may asynchronously delete the git branch. In v0.9.0 and earlier, agent work was silently lost on shutdown — the branch was destroyed before it could be merged.

Every code path that calls session.abort() now preserves the branch first. The worktree branch is copied to ensemble/preserved/{team}/{name} — a standalone git ref that OpenCode cannot delete.

New Tool: team_merge

Explicit per-agent branch merging. After shutting down a teammate, call team_merge to squash-merge their preserved branch into your working directory as unstaged changes.

team_shutdown("alice")  → branch preserved to ensemble/preserved/team/alice
team_merge("alice")     → changes land unstaged, review with git diff
team_cleanup            → safety-net merges any forgotten branches

All session.abort() Call Sites Covered

Call site	Protection
team_shutdown (idle/force)	preserveAndAbort()
team_shutdown (graceful)	Preserves before sending shutdown message
team_cleanup (force)	Preserves before aborting active members
Crash recovery	Preserves before aborting stale busy members
Watchdog timeout	Preserves before aborting timed-out members
busy_while_shutdown event	Verifies/re-preserves before re-abort

Also in this release

• gitStashPop checks exit code, falls back to plain pop, warns on failure
• Orphaned ensemble/preserved/* branches cleaned up on startup
• 20 new tests covering the full merge lifecycle
• AGENTS.md documents branch preservation as settled decision #12

Full Changelog: v0.9.0...v0.9.1